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    <title>NTFS Documentation: $Bitmap</title>
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      <h1><a href="index-2.html#NTFS" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/index.html#NTFS">NTFS</a> Documentation: $Bitmap</h1>

      <h2>Definition</h2>

      This is a <a href="MFT.html#system_file" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/MFT.html#system_file">system file</a> that indicates which <a href="glossary.html#LCN" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/glossary.html#LCN">LCN</a>s of the <a href="glossary.html#Volume" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/glossary.html#Volume">volume</a> are used.
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      <h2>Layout</h2>

      One bit for each <a href="glossary.html#LCN" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/glossary.html#LCN">LCN</a>, starting at <a href="glossary.html#LCN" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/glossary.html#LCN">LCN</a> 0. The bit is set when the <a href="glossary.html#LCN" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/glossary.html#LCN">LCN</a> is used.
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      <h2>Interest</h2>

      It increases the performance when searching for free space on the <a href="glossary.html#Volume" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/glossary.html#Volume">volume</a>. It also makes easy to extend the <a href="glossary.html#Volume" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/glossary.html#Volume">volume</a>: just extend this <a href="glossary.html#File" tppabs="http://www.via.ecp.fr/~regis/ntfs/new/glossary.html#File">file</a>.
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      <address><a href="mailto:regis@via.ecp.fr">Regis Duchesne</a> at <a href="javascript:if(confirm('http://www.via.ecp.fr/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.via.ecp.fr/'" tppabs="http://www.via.ecp.fr/">VIA</a>, <a href="javascript:if(confirm('http://www.ecp.fr/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.ecp.fr/'" tppabs="http://www.ecp.fr/">ECP</a>, France</address>
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